==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6c9/0x920 kernel/bpf/stackmap.c:274
Write of size 40 at addr ffff8880580bf010 by task syz.0.1647/10861

CPU: 0 PID: 10861 Comm: syz.0.1647 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:420
 kasan_report+0x10b/0x140 mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x235/0x290 mm/kasan/generic.c:189
 memcpy+0x3c/0x60 mm/kasan/shadow.c:66
 __bpf_get_stackid+0x6c9/0x920 kernel/bpf/stackmap.c:274
 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline]
 bpf_get_stackid_pe+0x33f/0x400 kernel/bpf/stackmap.c:334
 bpf_prog_6611c23d801ea08d+0x21/0x36
 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
 __bpf_prog_run include/linux/filter.h:607 [inline]
 bpf_prog_run include/linux/filter.h:614 [inline]
 bpf_overflow_handler+0x50b/0x790 kernel/events/core.c:10321
 __perf_event_overflow+0x457/0x630 kernel/events/core.c:9496
 perf_event_overflow kernel/events/core.c:9517 [inline]
 perf_swevent_hrtimer+0x472/0x630 kernel/events/core.c:10967
 __run_hrtimer kernel/time/hrtimer.c:1751 [inline]
 __hrtimer_run_queues+0x4e7/0xc90 kernel/time/hrtimer.c:1815
 hrtimer_interrupt+0x399/0x980 kernel/time/hrtimer.c:1877
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:perf_ioctl+0x1fea/0x23e0 kernel/events/core.c:-1
Code: 2d da ff 45 31 ff eb 08 41 89 c7 e8 20 2d da ff 48 8b 7c 24 18 e8 16 08 91 08 4c 8b 74 24 10 4d 63 ff 4d 89 6e 22 4d 89 6e 2a <48> 8b 5c 24 78 48 89 df 48 83 c7 48 e8 f5 07 91 08 48 89 df e8 5d
RSP: 0018:ffffc9000c2bfc40 EFLAGS: 00000246
RAX: ffffffff81a7f010 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000ff6f000 RSI: 00000000000008c3 RDI: 00000000000008c4
RBP: ffffc9000c2bfed8 R08: ffff888074769bf7 R09: 1ffff1100e8ed37e
R10: dffffc0000000000 R11: ffffed100e8ed37f R12: 0000000040042408
R13: f8f8f8f8f8f8f8f8 R14: fffff52001857f98 R15: 0000000000000000
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd1a479e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd1a561b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd1a4a26180 RCX: 00007fd1a479e019
RDX: 000000000000000c RSI: 0000000040042408 RDI: 000000000000000d
RBP: 00007fd1a483500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd1a4a26218 R14: 00007fd1a4a26180 R15: 00007ffc7bc82c48
 </TASK>

Allocated by task 10861:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:936 [inline]
 __kmalloc_node+0xb2/0x240 mm/slab_common.c:943
 kmalloc_node include/linux/slab.h:589 [inline]
 __bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline]
 bpf_map_area_alloc+0x47/0xe0 kernel/bpf/syscall.c:341
 prealloc_elems_and_freelist+0x86/0x1c0 kernel/bpf/stackmap.c:51
 stack_map_alloc+0x386/0x510 kernel/bpf/stackmap.c:117
 find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
 map_create+0x524/0xff0 kernel/bpf/syscall.c:1149
 __sys_bpf+0x38b/0x780 kernel/bpf/syscall.c:5014
 __do_sys_bpf kernel/bpf/syscall.c:5136 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5134 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5134
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486
 call_rcu+0x14f/0x950 kernel/rcu/tree.c:2849
 nf_unregister_net_hook net/netfilter/core.c:-1 [inline]
 nf_unregister_net_hooks+0xc7/0x130 net/netfilter/core.c:601
 nf_defrag_ipv4_disable+0x91/0xe0 net/ipv4/netfilter/nf_defrag_ipv4.c:162
 nf_ct_netns_do_put net/netfilter/nf_conntrack_proto.c:562 [inline]
 nf_ct_netns_put+0x2d6/0x510 net/netfilter/nf_conntrack_proto.c:641
 nf_conncount_destroy+0x3d/0x150 net/netfilter/nf_conncount.c:687
 ovs_ct_limit_exit net/openvswitch/conntrack.c:1919 [inline]
 ovs_ct_exit+0x98/0x200 net/openvswitch/conntrack.c:2322
 ovs_exit_net+0xe9/0x7a0 net/openvswitch/datapath.c:2687
 ops_exit_list net/core/net_namespace.c:172 [inline]
 cleanup_net+0x703/0xba0 net/core/net_namespace.c:640
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff8880580bf000
 which belongs to the cache kmalloc-cg-64 of size 64
The buggy address is located 16 bytes inside of
 64-byte region [ffff8880580bf000, ffff8880580bf040)

The buggy address belongs to the physical page:
page:ffffea0001602fc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x580bf
memcg:ffff88807d667401
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea000163c840 dead000000000008 ffff888017442780
raw: 0000000000000000 0000000080200020 00000001ffffffff ffff88807d667401
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 6088, tgid 6088 (kworker/u4:27), ts 370030940903, free_ts 370007290050
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560
 prep_new_page mm/page_alloc.c:2567 [inline]
 get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358
 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658
 alloc_slab_page+0x5d/0x180 mm/slub.c:1799
 allocate_slab mm/slub.c:1944 [inline]
 new_slab+0x87/0x2d0 mm/slub.c:1997
 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154
 __slab_alloc mm/slub.c:3240 [inline]
 slab_alloc_node mm/slub.c:3325 [inline]
 __kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3398
 __do_kmalloc_node mm/slab_common.c:935 [inline]
 __kmalloc_node+0xa2/0x240 mm/slab_common.c:943
 kmalloc_node include/linux/slab.h:589 [inline]
 kvmalloc_node+0x6c/0x180 mm/util.c:581
 kvmalloc include/linux/slab.h:716 [inline]
 kvzalloc include/linux/slab.h:724 [inline]
 allocate_hook_entries_size net/netfilter/core.c:61 [inline]
 __nf_hook_entries_try_shrink+0x336/0x700 net/netfilter/core.c:248
 __nf_unregister_net_hook+0x4da/0x6d0 net/netfilter/core.c:508
 nf_unregister_net_hook net/netfilter/core.c:-1 [inline]
 nf_unregister_net_hooks+0xc7/0x130 net/netfilter/core.c:601
 nf_ct_netns_do_put net/netfilter/nf_conntrack_proto.c:560 [inline]
 nf_ct_netns_put+0x2ce/0x510 net/netfilter/nf_conntrack_proto.c:641
 nf_conncount_destroy+0x3d/0x150 net/netfilter/nf_conncount.c:687
 ovs_ct_limit_exit net/openvswitch/conntrack.c:1919 [inline]
 ovs_ct_exit+0x98/0x200 net/openvswitch/conntrack.c:2322
 ovs_exit_net+0xe9/0x7a0 net/openvswitch/datapath.c:2687
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1487 [inline]
 free_pcp_prepare mm/page_alloc.c:1537 [inline]
 free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414
 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509
 poll_freewait+0x1ab/0x210 fs/select.c:153
 do_select+0x184b/0x1920 fs/select.c:609
 core_sys_select+0x753/0x980 fs/select.c:678
 do_pselect fs/select.c:760 [inline]
 __do_sys_pselect6 fs/select.c:801 [inline]
 __se_sys_pselect6+0x2f4/0x3c0 fs/select.c:792
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff8880580bef00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880580bef80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8880580bf000: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff8880580bf080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880580bf100: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
   0:	2d da ff 45 31       	sub    $0x3145ffda,%eax
   5:	ff                   	ljmp   (bad)
   6:	eb 08                	jmp    0x10
   8:	41 89 c7             	mov    %eax,%r15d
   b:	e8 20 2d da ff       	call   0xffda2d30
  10:	48 8b 7c 24 18       	mov    0x18(%rsp),%rdi
  15:	e8 16 08 91 08       	call   0x8910830
  1a:	4c 8b 74 24 10       	mov    0x10(%rsp),%r14
  1f:	4d 63 ff             	movslq %r15d,%r15
  22:	4d 89 6e 22          	mov    %r13,0x22(%r14)
  26:	4d 89 6e 2a          	mov    %r13,0x2a(%r14)
* 2a:	48 8b 5c 24 78       	mov    0x78(%rsp),%rbx <-- trapping instruction
  2f:	48 89 df             	mov    %rbx,%rdi
  32:	48 83 c7 48          	add    $0x48,%rdi
  36:	e8 f5 07 91 08       	call   0x8910830
  3b:	48 89 df             	mov    %rbx,%rdi
  3e:	e8                   	.byte 0xe8
  3f:	5d                   	pop    %rbp